TITLE: GCN CIRCULAR NUMBER: 27381 SUBJECT: IPN triangulation of GRB 200311A DATE: 20/03/13 12:49:49 GMT FROM: Dmitry Svinkin at Ioffe Institute IPN triangulation of GRB 200311A D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team, K. Hurley, on behalf of the IPN, A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report: The long-duration GRB 200311A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27363; AGILE-MCAL detection: Ursi et al., GCN Circ. 27365; AstroSat-CZTI detection: Gupta et al., GCN Circ. 27371) was detected by Fermi (GBM trigger 605632577), Konus-Wind, INTEGRAL (SPI-ACS), AGILE-MCAL, and AstroSat-CZTI at about 54973 s UT (15:16:13). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 209.245 (13h 56m 59s) -50.054 (-50d 03' 15") Corners: 206.898 (13h 47m 35s) -52.496 (-52d 29' 46") 211.898 (14h 07m 35s) -47.578 (-47d 34' 42") 211.296 (14h 05m 11s) -47.578 (-47d 34' 39") 206.215 (13h 44m 52s) -52.473 (-52d 28' 23") --------------------------------------------- The error box area is 2.0 sq. deg, and its maximum dimension is 6.1 deg (the minimum one is 21 arcmin). The Sun distance was 117 deg. This box may be improved. The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final position (GCN Circ. 27363). A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200311_T54974/IPN The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.